FREMONT — The Fremont school board's plan for later start times to the school day will be implemented — well, later.

After making a push in March to have later start and end times to the junior high and high school day, trustees on Wednesday said they were "disappointed" that bus scheduling problems and other timing conflicts were not brought to their attention sooner.

Last month, the board had decided to have high school students in class 8 a.m. to 3 p.m. — 25 minutes later than the current schedule — and to have junior high students in their seats 10 minutes later — from 8:15 a.m. to 2:25 p.m., starting in the fall.

But trustees learned this week that pushing back the school day could require four more bus routes to be added.

Also raised were scheduling conflicts for high school students wishing to enroll in the Mission Valley Regional Occupational Program, adult school or Ohlone College classes; or who hold after-school jobs. Other concerns included the possibility that parents would drop off their children at school — unsupervised — early before work.

Such issues prompted high school principals to recommend that the later start times be delayed until fall 2011, to give staff members a year to address the concerns.

In response, trustees Bryan Gebhardt and Lara York this week asked if it would be possible to start the new schedule midyear if a fall rollout date was not possible.

"It's not clear if midyear is possible "... (but) I'd like to be as responsive to the community as possible. They made it clear in a survey that this is something the community and students want," Gebhardt said Thursday.

Medical studies show that teens biologically are wired to wake later, and studies have linked added sleep with improved health and academic success. A recent community survey also showed support for later start times.